Year	Percent change (Units)
1980	4.886
1981	-0.178
1982	2.174
1983	-3.864
1984	-16.820
1985	7.718
1986	6.352
1987	0.088
1988	6.871
1989	0.957
1990	-1.308
1991	-0.440
1992	2.001
1993	0.323
1994	1.858
1995	2.454
1996	0.100
1997	1.527
1998	9.975
1999	-0.222
2000	-1.209
2001	7.269
2002	4.920
2003	2.184
2004	0.362
2005	7.335
2006	5.933
2007	3.144
2008	7.733
2009	1.963
2010	8.581
2011	2.356
2012	10.542
2013	5.311
2014	6.644
2015	4.393
2016	5.741
2017	5.001
2018	7.007
2019	6.143
2020	3.550
2021	1.399
2022	11.904
2023	1.409
2024	10.424
2025	6.086
2026	5.914
2027	5.830
2028	5.956
2029	5.974